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I just started having this same problem a few days ago with my 2001 Accord (281,000 mi). Just refueled and retightened the cap, and my plan was to wait a few days to see if the code resolves.
Your question about it taking “7+ days to show again” is explained in Honda’s Factory Service Manual, which states that the P1456 code for 98-02 Accords:
“[i]This is a two-trip code; once cleared, it cannot be
reproduced in one trip. Also, [u]certain specific driving
and ambient conditions must occur before the ECM/
PCM will complete the system checks[/u]. Additional test
drives may still not meet the specific conditions needed
to reproduce the code.[/i]”Honda’s Factory Service Manual troubleshooting method is as follows:
1. Check Gas Cap is tightened to 3 clicks
[indent]A. Replace or Tighten Cap[/indent]
2. Check Gas Cap Seal
[indent]A. Seal Damaged or Missing?
[indent]a. If Damaged or Missing: Replace
b. If Okay: Go to 3.[/indent][/indent]
3. EVAP Bypass Solenoid Valve Test
4. Vacuum Hoses and Connections TestI just started having this same problem a few days ago with my 2001 Accord (281,000 mi). Just refueled and retightened the cap, and my plan was to wait a few days to see if the code resolves.
Your question about it taking “7+ days to show again” is explained in Honda’s Factory Service Manual, which states that the P1456 code for 98-02 Accords:
“[i]This is a two-trip code; once cleared, it cannot be
reproduced in one trip. Also, [u]certain specific driving
and ambient conditions must occur before the ECM/
PCM will complete the system checks[/u]. Additional test
drives may still not meet the specific conditions needed
to reproduce the code.[/i]”Honda’s Factory Service Manual troubleshooting method is as follows:
1. Check Gas Cap is tightened to 3 clicks
[indent]A. Replace or Tighten Cap[/indent]
2. Check Gas Cap Seal
[indent]A. Seal Damaged or Missing?
[indent]a. If Damaged or Missing: Replace
b. If Okay: Go to 3.[/indent][/indent]
3. EVAP Bypass Solenoid Valve Test
4. Vacuum Hoses and Connections Test